My car does not have the microfilter or spark plug on the iDrive menu. Am i missing something? My car is 335i e92 2008 model.
So the question is how do i tell the car i changed the microfilter?

My September 2007 building E92 doesn't have the mircofilter or spark plug service indicators in the iDrive menu either but the dealer told me it's just a software thing and not an error with the car.

I have owned my car since new so I know when certain things like spark plugs have been replaced but things like spark plugs and microfilter are listed above each stamp area in the service booklet. Most dealers fill these in correctly so if these items have been replaced, it should be ticked in your service books.